1N4750UR-1/TR

Overview

The Microchip Technology 1N4750UR-1/TR is a surface mount glass Zener diode with a nominal voltage of 27V. It operates within the 1N4728AUR through 1N4764AUR series, offering a standard voltage tolerance of +/- 5%. The device features a hermetically sealed DO-213AB glass MELF package and supports a maximum power dissipation of 1.0 watt at 25°C. Electrical characteristics include a test current (IZT) of 9.5 mA, a maximum dynamic impedance (ZZT) of 35 Ohms, and a maximum reverse current (IR) of 5 µA at a test voltage of 5V. The component is rated for an operating temperature range from -65°C to +175°C.

Feature Summary

• Hermetically sealed glass MELF package suitable for high reliability applications
• Surface mount design ideal for high density mounting with low parasitic requirements
• Inherently radiation hard per MicroNote 050
• Non-sensitive to electrostatic discharge

Applications

• Voltage regulation in high density circuit designs
• High reliability applications requiring source control drawings
• Circuits requiring broad operating current and temperature range stability

Procurement Notes

Verify that the ordering suffix matches the required specifications. The 'TR' suffix indicates tape and reel packaging, while the absence of specific screening prefixes denotes standard commercial grade. Confirm RoHS compliance status if required by the assembly process. Ensure the part number aligns with the desired voltage tolerance, as the 'A' suffix specifies +/- 5% tolerance. Cross-reference the manufacturer's latest documentation for any updates to mechanical or electrical parameters before finalizing procurement orders.

Selection Notes

Select this component when a surface mount equivalent to the axial 1N4750A is required. The DO-213AB package provides a leadless form factor beneficial for automated placement. Consider the thermal resistance of 130°C/W junction to ambient on FR4 when designing heat dissipation strategies. Verify that the application current remains within the specified maximum regulator current limits to ensure stable Zener operation across the full temperature range.

Part Context

This device belongs to the 1N4728AUR through 1N4764AUR series of surface mountable 1-watt Zener diodes. It is electrically equivalent to the JEDEC registered 1N4728A through 1N4764A registration but utilizes the DO-213AB outline. The series also carries the alternate identification MLL4728A through MLL4764A. These components are manufactured by Microsemi's Scottsdale Division and are designed to replace traditional axial leads in modern surface mount technology assemblies.

Replacement Considerations

Direct surface mount equivalents are available as SMAJ4750A. For axial lead replacements, the 1N4750A serves as the functional counterpart. When substituting, verify that the package footprint and polarity markings match the existing board layout. Ensure the replacement part meets the same voltage tolerance and power dissipation requirements.